domain name system - Windows AD with external DNS

How do I configure Windows AD to use an external DNS server? We have a tool for managing DNS. We're attempting to use Windows AD for authentication. In order to get a server to join the domain, we must point it to the AD server as DNS. However, in so doing, the server that is pointed to the AD server for DNS can no longer resolve hostnames in our environment.

We're using example.com for our login domain across the environment. All of our servers are servername.subdomain.example.com.

When I join servername1.subdomain.example.com to the domain it can no longer resolve servername2.subdomain.example.com, unless I manually add the DNS entry for servername2.subdomain.example.com do the DNS on the AD server.

We don't want to have to create two DNS entries for everything so we need the AD server to look at the external DNS server for DNS.

I attempted to create a Forward Lookup Stub zone for subdomain.example.com but when I get to the "Specify the DNS servers from which you want to load the zone" and enter my dns server I get an error when attempting to validate: "An unknown error occurred"

Attempting to add a new delegation under my existing example.com domain is bet with the same error when adding DNS servers.

Admittedly, I'm not a Windows Admin and my understanding of AD is superficial at best, but it seems like what I'm asking for should be relatively simple... I'm just looking for a recursive lookup on hostnames from the domain controller.

Any pointers in the right direction are greatly appreciated.

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